CN201317709Y

CN201317709Y - Membrane bioreactor

Info

Publication number: CN201317709Y
Application number: CNU2008202240353U
Authority: CN
Inventors: 李运玮
Original assignee: SHANDONG JINGLU CANAL GROUP CO Ltd
Current assignee: SHANDONG JINGLU CANAL GROUP CO Ltd
Priority date: 2008-11-24
Filing date: 2008-11-24
Publication date: 2009-09-30
Anticipated expiration: 2018-11-24

Abstract

The utility model provides a membrane bioreactor, which belongs to the field of sewage treatment equipment. The structure comprises a tank body, an anoxic zone, an aerobic zone, a membrane zone, a membrane unit, a bottom aeration system and a bottom aeration main, wherein the tank body is divided into the anoxic zone and the aerobic zone, the membrane zone is arranged inside the aerobic zone, the membrane unit is positioned inside the membrane zone, the bottom aeration system connected with the bottom aeration main is arranged at the bottom of the aerobic zone and the membrane zone, the membrane unit is connected with an air inlet main via an air inlet branch pipe of the membrane unit and further connected with a water outlet main via a water outlet branch pipe of the membrane unit, and the water outlet main is upward connected with a water self-sucking pump. With a blower to provide sewage with oxygen via the bottom aeration system, the utility model meets the oxygen requirements of microorganism for growth and degradation of organic matter. Simultaneously, the utility model is capable of returning sludge via a return sludge pump. Further, the membrane zone is arranged inside the aeration zone, the water self-sucking pump can suck out the sewage, perform membrane filtering process, and finally meet the requirement for water quality. The utility model has the advantages of simple technical process, small occupying area, rare sludge removal, easy realization of full automatic control and the like.

Description

Membrane bioreactor

(1) technical field

The utility model relates to a kind of sewage disposal device, specifically a kind of membrane bioreactor.

(2) background technology

Along with developing rapidly of modern industry, the continuous expansion of city size, the water consumption and the wastewater flow rate in city constantly increase, and cause city water resource not enough day by day, and water quality is abominable day by day.For addressing this problem, many in the world countries have carried out the research that waste water reclamation utilizes in succession.What wherein research was the most active is to adopt aerobic film-bioreactor processing municipal wastewater and carry out regeneration.

Membrane bioreactor is called for short MBR, it is the water treatment new and high technology that the twentieth century end grows up, it combines membrane separation technique and traditional biological treatment, be mainly used in sewage treatment area, it mainly is to have replaced the second pond of traditional biological in handling with membrane module (hollow-fibre membrane), utilize membrane module to carry out solid-liquid separation, active sludge is trapped in the reactor, but membrane module water outlet reuse or efflux.The removal mechanism of its organic pollutant shows: except that the biochemistry of traditional active sludge was removed, removal effect more efficiently was--the filtering technique of film and the biological action with complicated chorologic cake layer of film surface attachment.Membrane filtration solved on the one hand mud-water separation in the traditional biological treatment process only depend on gravity settling not thoroughly, the water outlet drawback of still taking a large amount of suspended substances out of; Simultaneously film has been held back microorganism, has avoided mud-water separation and the loss of the living microorganism that causes, and whole plant reaches more than 90% the organic pollutant removal rate, and stable effluent quality is reliable.

The membrane bioreactor mechanism of action

Divide oxygen-starved area, aerobic zone and film district in the membrane bioreactor.Aerobic zone is provided with aerator, and the cutting action from the gas of blower fan passes through aerator forms micro-bubble, and the organic pollutant in the sewage is carried out the biochemical degradation effect.The water of aerobic zone enters the film district from the dividing plate bottom, and the built-in membrane module in film district mainly is the filteration that the sewage that the aerobic zone biochemical degradation is crossed is carried out again film.Aerobic zone is provided with sludge reflux pump, returned sluge is back to the oxygen-starved area, with carry out anti-nitration reaction after former water mixes, thereby formed unique technology of anoxic, aerobic, membrane filtration, effective dephosphorization denitrogenation in effective degraded CODcr, BOD5.Membrane bioreactor had both utilized the selection perviousness and the high efficiency of membrane sepn, had utilized biological treatment validity and thoroughness again, and effluent quality can meet the demands fully.The mechanism of action of hollow-fiber module aspect degradation of organic substances roughly has four aspects in the membrane bioreactor:

1. the physics crown_interception of the cake layer on hollow-fibre membrane and film surface:

Film surface in the membrane bioreactor is because concentration polarization causes gathering of active sludge that the film surface is trapped, form the porous cake layer, be equivalent to add a skim on the film surface of 0.1 μ m, formed barrier one, make the small-molecule substance of solubility can see through hollow-fibre membrane originally, now be subjected to stopping of filter cake, be trapped within the reactor;

2. the cake layer microorganism is at film surface adsorption and biological degradation:

Asymmetric hollow-fibre membrane has on its surperficial cake layer of very big surface-area has assembled a large amount of microorganisms, the enzyme that a large amount of degradation of organic substances are arranged in the biology, under the katalysis of enzyme, organism that is trapped on the cake layer or part solubility small organic molecule obtain oxygenolysis, being equivalent to have passed through one deck microbial film by the filtrate of cake layer handles, further reduce organic concentration in the water outlet, improved effluent quality.But want dialectical seeing for cake layer, polarization along with concentration difference, cake layer is more and more thicker, so increased permeable resistance, also increased simultaneously the resistance to mass transfer of oxygen, microorganism oxygen supply deficiency in the cake layer and degradation capability descends is so suitably control cake layer thickness, can utilize cake layer to obtain the water outlet of better quality, can obtain satisfied water flow again;

3. the biochemical action of main body mixed solution mud in film near surface biological floe fluidised bed and the reactor:

Membrane bioreactor is removed main biochemical degradation effect of leaning on tunicle and cake layer to be trapped in the active sludge microorganism in the reactor to organic degraded.Organism that biological flock is entrained and the meta-bolites of biological flock own are when it contacts with the reactor body liquid phase, become CO2 and H2O by the thorough mineralising of main body biological sludge, so organic cod can not accumulate and influences effluent quality and reduce water flow in the membrane bioreactor;

4. the catalyzed degradation effect of lyoenzyme in membrane micropore:

Inner because the various enzymes that cell is secreted infiltrate the inner biological enzyme that forms of membrane micropore at the tubular fibre membrane micropore, repeatably successive specificity catalytic decomposition organism improves effluent quality.But these infiltrate in the fenestra, the support frame of tunicle or the adsorbed biological enzyme of membrane micropore inwall active group, its enzyme quantity is few, and water outlet is extremely short in the enzyme surface residence time, compared with cake layer microbial enzyme quantity on active sludge in the reactor and the film, its biological degradation is very little.

(3) summary of the invention

Technical assignment of the present utility model is at the deficiencies in the prior art, and a kind of reasonable in design, simple in structure, membrane bioreactor that level of automation is high is provided.

The technical scheme that its technical problem that solves the utility model adopts is:

Membrane bioreactor, comprise pond body, oxygen-starved area, aerobic zone, film district, film unit, bottom aerating system, bottom aeration house steward, the pond body divides oxygen-starved area and aerobic zone two parts, aerobic zone inside is provided with the film district again, be provided with more than one film unit in the film district again, the bottom in aerobic zone and film district is provided with the bottom aerating system, bottom aerating system and bottom aeration house steward are joined, film unit joins by film unit air intake branch and inlet manifold, film unit joins by film unit exit branch and outfall sewer, picks out the water vacuum primingpump on the outfall sewer.

Above-mentioned membrane bioreactor, its film unit are arranged on the film lifting guide rail, and film lifting guide rail is arranged on film and supports on the channel-section steel, and film supports channel-section steel and is horizontally installed on the inwall in film district.

Above-mentioned membrane bioreactor, the bottom in its film district also is provided with the pipeline that joins with sludge reflux pump, and the other end of pipeline leads to the oxygen-starved area.

The utility model utilizes gas blower by the bottom aerating system sewage to be carried out oxygenation, satisfies the oxygen requirement of microorganism self growth and the oxygen requirement of degradation of organic substances, carries out mud by sludge reflux pump simultaneously and refluxes; Aerobic zone inside is provided with the film district, by the water outlet vacuum primingpump sewage is carried out membrane filtration, satisfies water quality requirement.

Membrane bioreactor of the present utility model compared with prior art, the beneficial effect that is produced is:

1) technical process is simple: it in one, is immersed into the function JiMBRChi of the aeration tank in the traditional process, second pond and sludge thickener in the MBR pond with film, biochemical after-filtration water outlet, and technology simply is easy to management;

2) save occupation of land: because technical process is simple, processing unit is few, and hydraulic detention time is less than traditional activated sludge process, thus Chi Rongxiao, compact construction;

3) need spoil disposal hardly: because this equipment can move more than sludge concentration 10g/l, organic loading is handled lower than traditional biological, organic pollutant in the MBR pond of high sludge concentration by decomposing oxidation comparatively completely, so excess sludge does not almost have, for general sanitary sewage, decide according to concrete running condition, generally can consider to arrange slightly half a year;

4) be easy to realize full automatic control: complete machine can be realized automatic intermittent operation, and system's pump valve is abideed by the program start and stop automatically, is provided with controls such as water level is controlled automatically, the anti-pollution control of film, fault alarm, and control panel is concentrated modularization, is convenient to observe.

(4) description of drawings

Accompanying drawing 1 is a theory structure synoptic diagram of the present utility model.

Among the figure, 1, the pond body, 2, the oxygen-starved area, 3, aerobic zone, 4, the film district, 5, film unit, 6, bottom aerating system, 7, bottom aeration house steward, 8, the film unit air intake branch, 9, inlet manifold, 10, the film unit exit branch, 11, outfall sewer, 12, water outlet vacuum primingpump, 13, film lifting guide rail, 14, film supports channel-section steel, 15, sludge reflux pump.

(5) embodiment

Below in conjunction with explaining below 1 pair of membrane bioreactor work of the present utility model of accompanying drawing.

As shown in Figure 1, membrane bioreactor of the present utility model, its structure is by comprising pond body 1, oxygen-starved area 2, aerobic zone 3, film district 4, film unit 5, bottom aerating system 6, bottom aeration house steward 7,1 fen oxygen-starved area 2 of pond body and aerobic zone 3 two partss, aerobic zone 3 inside are provided with film district 4 again, be provided with more than one film unit 5 in the film district 4 again, the bottom in aerobic zone 3 and film district 4 is provided with bottom aerating system 6, bottom aerating system 6 and bottom aeration house steward 7 are joined, film unit 5 joins with inlet manifold 9 by film unit air intake branch 8, film unit 5 joins by film unit exit branch 10 and outfall sewer 11, picks out water vacuum primingpump 12 on the outfall sewer 11.

Above-mentioned film unit 5 is arranged on the film lifting guide rail 13, and film lifting guide rail 13 is arranged on film and supports on the channel-section steel 14, and film supports channel-section steel 14 and is horizontally installed on the inwall in film district 4.

The bottom in above-mentioned film district 4 also is provided with the pipeline that joins with sludge reflux pump 15, and the other end of pipeline leads to oxygen-starved area 2.

Its processing and fabricating of membrane bioreactor of the present utility model is simple and convenient, and processing and fabricating gets final product shown in the by specification accompanying drawing.

Except that the described technical characterictic of specification sheets, be the known technology of those skilled in the art.

Claims

1, membrane bioreactor, comprise pond body (1), oxygen-starved area (2), aerobic zone (3), film district (4), film unit (5), bottom aerating system (6), bottom aeration house steward (7), it is characterized in that, pond body (1) divides oxygen-starved area (2) and aerobic zone (3) two parts, aerobic zone (3) inside is provided with film district (4) again, be provided with more than one film unit (5) in the film district (4) again, the bottom of aerobic zone (3) and film district (4) is provided with bottom aerating system (6), bottom aerating system (6) and bottom aeration house steward (7) are joined, film unit (5) joins with inlet manifold (9) by film unit air intake branch (8), film unit (5) joins by film unit exit branch (10) and outfall sewer (11), picks out water vacuum primingpump (12) on the outfall sewer (11).

2, membrane bioreactor according to claim 1, it is characterized in that, film unit (5) is arranged on the film lifting guide rail (13), and film lifting guide rail (13) is arranged on film and supports on the channel-section steel (14), and film supports channel-section steel (14) and is horizontally installed on the inwall of film district (4).

3, membrane bioreactor according to claim 1 is characterized in that, the bottom of film district (4) also is provided with the pipeline that joins with sludge reflux pump (15), and the other end of pipeline leads to oxygen-starved area (2).